In a lonely corner of the
world, on the edge of No Man's Land, sits Clocktower Fortress.

It's home to the 1121st Platoon of the Helvetian Army, and
their newest member is 15-year-old volunteer Kanata Sorami, who enlisted to
learn how to play the bugle. When she was a child, Kanata was saved by a
beautiful soldier and found inspiration in the clear, golden sound of her
trumpet. From that day onward, Kanata decided music would be her life. As the
other platoon members train her in how to be both a bugler and a soldier,
Kanata's enduring optimism will inspire them to look for happiness and beauty,
even in a world haunted by war.